The coin must be seen for a accurate assessment of value for this type of error, take it to a dealer to get a better idea on what the coin is worth.
This type of error is called 'Off Center'. The more of the impression missing, the more it is valued, but those with a readable date and mint mark are the most valuable. If your penny (with no date) is an Indian Head penny it is worth $55.00. If it is a steel penny it is worth $45.00. Wheat pennies and Lincoln Memorial pennies are only worth $3.50.
This type of minting error is called 'Off Center'. the coins with nearly all the impression missing are worth more, but those with those with date and mint mark are worth the most. Average worth of a wheat penny with off center error is $3.50.
in the uk penny policy to this date is worth about £7000
Nobody can give you a value for a coin without knowing its date. Please post a new question and include a date and condition.
If the coin is that worn that the date is illegible, it will be worth nothing.
In general, and without a great deal more detail provided, about one cent.
Please post new question with a date for your " Watergate" penny.
By looking for a date did you know that if a 20p has no date it is worth 5,000
A Greek one penny with a 1921 date on it is worth about $10. The exact amount will depend upon the condition that the penny is in.
If you found the coin in circulation its worth about 3-6 cents. If it is in original mint packaging then it is worth about $1
With a date of 1691 it's not a US penny. Post new question.
The value is determined by the date, mint mark, and condition. Without knowing any of those factors, your question is impossible to answer.